If $x$ takes a negative permissible value,then $\sin^{-1} x$ is equal to
- A$-\cos^{-1} \sqrt{1-x^{2}}$
- B$\cos^{-1} \sqrt{x^{2}-1}$
- C$\pi - \cos^{-1} \sqrt{1-x^{2}}$
- D$\cos^{-1} \sqrt{1-x^{2}}$
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